Product Overview
Dwyer Magnehelic 605-2 Differential Pressure Indicating Transmitter, 4-20 mA, 0-2" WC, 10-35 VDC
Condition
Unused NOS. Removed from original packaging for calibration and inspection before storage; shows no signs of use. Dial pointer rests at zero, bezel intact with no cracks observed, markings fully legible. Sourced from a government research facility.
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Product Overview
Dwyer Instruments' Magnehelic 605-2 is a differential pressure indicating transmitter covering 0-2.0" WC. It combines a direct-reading analog dial with a 2-wire 4-20 mA output signal in a single unit, allowing a technician to read pressure locally at the measurement point while simultaneously feeding data to a building automation system, PLC, or control room. Power requirement is 10-35 VDC. Process connections are 1/8" female NPT. Calibrated for vertical mounting (diaphragm in vertical position) at standard factory settings. Suitable for air and non-combustible compatible gases only. Maximum allowable pressure is 5 PSIG per the caution label on the unit.
Key Features
- Pressure range: 0-2.0" WC (inches of water column)
- Output: 4-20 mA, 2-wire loop-powered
- Power supply: 10-35 VDC
- Process connections: 1/8" female NPT
- Mechanical accuracy: +/-2% full scale
- Electrical accuracy: +/-0.5% full scale (includes linearity, hysteresis, repeatability)
- Maximum pressure: 5 PSIG (34.47 kPa) per data label on unit
- Temperature range: 20-120°F (-6.67 to 48.9°C)
- Standard calibration: diaphragm in vertical position
- Brushed aluminum case with Magnehelic dial face; ZERO and SPAN front-accessible adjustment ports
- CE marked; code N36Z visible on bezel
Applications
- HVAC technician connecting the 605-2 across a commercial air handler filter to monitor differential pressure during routine maintenance, reading the dial on-site while the 4-20 mA output logs data back to the building automation system
- Facility engineer commissioning a cleanroom who needs both a local pressure confirmation at the door and a continuous electronic signal feeding the central monitoring and alarm system
- Building maintenance professional troubleshooting airflow in a VAV system by tapping into ductwork to identify blockages or filter loading without pulling the control panel
- Lab or light industrial setup where a maker or DIY builder needs a calibrated differential pressure reference with an analog output for data acquisition or custom control loops
Frequently Asked Questions
What power supply does the 605-2 require?
10-35 VDC. It is a 2-wire loop-powered device, so the same two wires carry both power and the 4-20 mA signal.
What are the process connection sizes?
1/8" female NPT on both high and low pressure ports.
Does mounting orientation affect accuracy?
Yes. The unit is factory-calibrated with the diaphragm in the vertical position. Mounting in a different orientation without recalibration may affect accuracy.
Is this suitable for use with combustible gases?
No. The 605-2 is rated for air and non-combustible compatible gases only.
What is included with this unit?
The transmitter unit as shown. A flat mounting bracket and hardware are visible alongside the unit in the product photos. No additional accessories are confirmed included.
How does the 605-2 differ from other models in the Series 605?
The primary difference is pressure range. The 605-2 covers 0-2.0" WC. Other models in the series include the 605-3 (0-3.0" WC), 605-6 (0-6.0" WC), and 605-10 (0-10" WC). Confirm your required range before ordering.
The dial still reads zero - not because it was never installed, but because whoever checked it put it away correctly. That's the kind of care that makes a 25-year-old instrument worth trusting on a critical loop today.
